the rtx_tx for me shows me during the noisy time (evening) and rtx_c has similar graph rtx_u shows when an error has occured just like CRC or ES and it also shows up as an error on errored seconds but why have a duplicate.
i would go for rtx_tx as it has more usefull info to a specific line.
It is a good question how much the two graphs overlap, and whether it is worth showing just one of them. Remember too that the graphs (right now) have two distinct purposes: the usual one of letting "normal" people see that statistics for their own line, plus the unusual one of the "technical" people (including me) trying to educate ourselves about what is going on ... in order to simplify things when helping others.
Right now that probably means showing more stuff than necessary, so we can work out whether we can ignore it later.
So..
If we consider some scenarios involving the rtx_* counters, perhaps we can see the interplay between them:
1) If rtx_tx is non-zero, while rtx_uc is zero (or close), it shows that retransmission works effectively at getting broken packets through.
2) If rtx_c and rtx_tx counters show roughly the same number, then it shows that after a failure requiring a re-transmission, the very first re-transmission tends to work.
3) However, if rtx_c and rtx_tx start to differ significantly, but rtx_uc stays low, it implies that the initial re-transmissions can fail too, but that subsequent re-transmissions work.
4) If rtx-c and rtx_tx differ significantly, and rtx_c starts to rise, it implies all re-transmissions are not getting through.
For my line (numbers in the previous post), we can see that it shows scenario (1). We can also see that it shows somewhere between scenarios (2) and (3) ... This is a relatively good line, but it shows one direction (the one with the counters in the thousands; I assume this is the upstream direction) where twice as many blocks are re-transmitted as are received correctly ... yet we can also see that nothing has ultimately failed.
Seeing both the rtx_tx and rtx_c numbers tells me that, even on a good line, we should expect rtx_tx to run quite a lot higher than rtx_c. What we don't know is how much higher we should expect it, while still classifying the line as "good".
So it'd be interesting to see, for other lines, how much rtx_tx and rtx_c can differ when rtx_uc does start to increase. And it would be nice to see how these values vary across the time of day.